Oliver s



(No Model.) l O. S. GARRETSON.

SGHOOLTURNITURB. No. 246'570.l Patented Sept. 6,1881.

' slats aresecured to the iron frames,

UNTTED STATES PATENT OEEICE.

OLIVER S. GARRETSON, OF'BUFFALO, NEW YORK.

SCHOOL-FURNITURE.

SPECIFICATION forming part of Letters Patent No. 246,670, datedSeptember 6, 1881. Application filed April 19, 18H1. (No model.)

To all whom it may concern:

Be it known that LOmvEn S. GARnETsoN, of the city of Buffalo, in thecounty ot' Erie and State of New York, have invented new and usefulImprovements in School-Furniture, of which the following is aspecification, reference being had to the acco .fnpanying drawings.

This invention relates to an improved construction of school desks andseats, and has for its object to simplify the mea-ns whereby the woodenslats are secured to the iron frames, and to render the hinged seatseasy and noiseless in their operation.

My invention consists of the particular construction of the meanswhereby the wooden and of the construction ot' the hinges whereby thefolding seats are attached to the stationary standards, as hereinafterfully set forth.

In the accompanying drawings, Figure I is a fragmentary sectionalelevation of a schoolseat provided with my improvements. Fig. 2 is aninside elevation of the knuckle formed at the inner end of the seat armor iron. Fig. 3 is an inside elevation of the knuckle formed on thestandard, and to which the seat-arm is hinged. Fig. I is au outsideelevation ot' the same knuckle. Fig. 5 is a section through theseat-hinge in line x Fig. 1. Fig. 6 is asimilar section, on an enlargedscale, in line y y, Fig. 1. Fig. 7 is a reverse view ot' the plate whichcovers the inner side of the hinge. Figs. 8 and 9 are reverse and frontviews of the washer which is interposed between the covering-plate andthe knuckle of the standard. Fig. 1t) is a cross-section,on an enlargedscale, of the seat-iron,slat, and means whereby these parts are securedtogether. Fig. 11 is a similar view, showing a modified construction ofthe fastening.

Like letters of reference refer to like parts in the several figures.

A represents the slats or wooden portions of which the seat is composed.

B represents the arm to which the slats A are secured; and D representsa portion of the standard or stationary frame of the desk. The slats Aare constructed with a dovetail or uudercut groove, a, and the seat-armB is provided with a rib, b,which is placed in the groove a and fitsagainst one side thereof, leaving au open space between the oppositeside ot' the groove and the rib a.

C represents a clamping-dog, which projects with its head into the openspace between the rib b and the undercut side of the groove a, andsecures the rib b in the groove a. As shown in Fig. 10, the face ot' thedog- C tits against the inclined side of thedovetail groove, and thehack of the dog is made convex and fits in a concave depression, c, inthe side of the rib l). yThe outer end of the dog G is secured to theseat-arm by ascrew-bolt, d, the nut of which is held against turning inadepression on the outer side of the dog. After the rib b is inserted inthe slot a., the head of the dog C is inserted into the open spacebetween the rib and the sideof the slot, when by applying the screw-boltd the outer end oi' the dog is drawn against the seat-arm B and the headof the dog pressed against the side oi' the groove, whereby the rib b isfirmly pressed against the opposite side ot' the groove a., and theparts are firmly secured together. ln the moditication represented inFig. 11, both the face and the back of the head ot' the dog C are madeconvex, and the shank is arranged at right angles to the headand securedby a screw to the slats A, whereby the rib b is similarly secured in thegroove a. I prefer, however, the construction shown in Fig. 10,as it ismore efcient. A number of these clamping-dogs C are arranged at suitabledistances apart `on the seat-arm orl other part which is to be connectedwith the slat or other wooden portion of the seat or desk. rIhisfastening is readily applied and released at desire, and forms a verystrong and durable means for securing the parts together.

` E represents 4the knuckle formed ou the standard D, and forming partofthe seat-hinge. It is provided with two peripheral bearing-surfaces, ec', arranged on opposite sides of the center of the knuckle, and havingunequal radii, whereby two shoulders, ff', are formed on the knuckle.

g is a circular concave depression formed on the inner side of theknuckle E, around the central opening, h, through which thefasteningbolt h' passes.

I represents the knuckle formed on the seatarm, and provided with acurved recess, i,

which surrounds the larger peripheral bearingsurface of the knuckle E,and terminates in two shoulders, jj', which come in contact with theshouldersj'f ofthe knuckle E when the seat is down.

k k are two lugs formed on the inner side of the disk ofthe knuckle I,and projecting into curved recessesl Z,t`ormed in the outer side of theknuckle E. The ends of these recesses are provided with strips or blocksof rubber or other elastic material, against which the lugs k strikebefore the shoulders j j and ff come in contact when the seat is loweredand before the seat reaches its highest position when it is raised,thereby preventing noise.

L represents aconvex washer,which is placed aga-inst the concave recessgofthe knuckle E, and M is the coveiingplate, which is placed over thewasher L. The washer L is provided with two ears, l2, which tit inrecesses min thc plate M, whereby the washer L is compelled to move withthe plate M. The recesses m are made sufciently deep to permit rubberblocks n or other springs to be placed therein between the ears l2 ofthe washer L and the plate M, whereby the washeris pressed against theknuckle E and at the sainetinieperniitted to yield. The plate M isprovided with two ears, 0, which project beyond the peripheralbearing-surfaces of the knuckle E, and are connected with the knuckle Iby studs or projections p entering' sockets 19' in the knuckle I,whereby the plate M is compelled to move with the knuckle I. In swingingthe seat on its hinge the convex washer L forms a bearing surface, bywhich the movable knuckle works on the stationary knuckle, anditfurtherserves to center the parts, thereby preventing the peripheralbearing-surfaces from grinding upon each other. In this manner thefriction produced between the movable parts of the hinge is greatlyreduced, and an easy noiselessly-working hinge is produced.

I claim as my inventionl. The combination, with. the slat or otherwooden part A, provided with a dovetail or undercut groove, a, ot' aseat-arlu or other frame, B, provided with a rib, b, which fits againstone side of the groove a, and is provided on its opposite side withconcave depressionscand clampingjaws C, seated in said depressions andprojectinginto the open space between the rib band the side of thegroove a, and secured by screwbolts d, substantially as set forth.

2. rlhe combination, with the standardknuckle E, provided with acircular recess, g, of the seat-knuckle I, washer L, projectinginto therecess g, a co\f'eringplate, M, attached to the seat-knuckle, and one ormore springs interposed between the covering-plate and the washer,substantially as set forth.

3. rlhe combination, with the standardknuckle E, provided with acircular recess, g, of the seat-knuckle I, washer L, projecting into therecess g and provided with ears l2,the cov ering-plate M, attached tothe seat-knuckle and provided with recesses m, and springs u, arrangedin the recesses m and bearing against the ears ot' the washer,substantially as set forth.

0. S. GARRETSON.

Witnesses:

JNO. J. BoNNER, Enw. J. BRADY.

